esUniversia Recursos de Aprendizajehttp://biblioteca.universia.net/img/logotipo.jpghttp://biblioteca.universia.net/
The unreasonable effectiveness of experiments in constraining nova nucleosynthesishttp://biblioteca.universia.net/html_bura/ficha/params/title/the-unreasonable-effectiveness-of-experiments-in-constraining-nova-nucleosynthesis/id/60729605.html
Classical nova explosions arise from thermonuclear ignition in the envelopes of accreting white dwarfs in close binary star systems. Detailed observations of novae have stimulated numerous studies in theoretical astrophysics and experimental nuclear physics. These phenomena are unusual in nuclear astrophysics because most of the thermonuclear reaction rates thought to be involved are constrained by experimental measurements. This situation allows for rather precise statements to be made about...Parikh, Anuj RameshLatest generation white dwarf cooling models : theory and applicationshttp://biblioteca.universia.net/html_bura/ficha/params/title/latest-generation-white-dwarf-cooling-models-theory-and-applications/id/60543370.html
White dwarfs are the most common stellar evolutionary end-point. Moreover, they can be considered as reliable cosmic clocks to infer the age of a wide variety of stellar populations, including globular and open clusters. Consequently, there is a considerable interest in the study of white dwarf cooling models.
In this thesis we used two different approaches. From a theorical perspective, we computed a set of new cooling white dwarfs sequences which incorporates the most up-to-date physical ...Renedo Rouco, IsabelRecuperación de información astronómica : nuevas perspectivas de análisis de la cartografía celes...http://biblioteca.universia.net/html_bura/ficha/params/title/recuperacion-informacion-astronomica-nuevas-perspectivas-analisis-cartografia-celeste-historica/id/60358349.html
La mejora de la descripción de contenidos de recursos especializados en general, y de astronómicos en particular, es todavía una asignatura pendiente de las Ciencias de la Documentación. Actualmente existe gran cantidad de información astronómica histórica de interés recogida en diversos tipos de documentos que se conservan en archivos y bibliotecas astronómicas de todo el mundo. Entre estos documentos se encuentran los denominados catálogos y atlas de estrellas, así como imágenes astrofotogr...Alonso Lifante, María PilarUnderground study of the 17O(p,alpha)18F reaction relevant for explosive hydrogen burninghttp://biblioteca.universia.net/html_bura/ficha/params/title/underground-study-of-the-17o-p-alpha-18f-reaction-relevant/id/60179578.html
The 17O(p,γ )18F reaction affects the production of key isotopes (e.g., 18F and 18O) in the explosive hydrogen burning that powers classical novae. Under these explosive conditions, the reaction rate is dominated by contributions from a narrow resonance at Ec.m.= 183 keV and by the combined contributions of direct capture
and low-energy tails of broad resonances. At present, the astrophysical reaction rate is not well constrained because of the lack of data in the energy region appropriate to...Di Leva, A; Scott, D.A.; Caciolli, A.; Formicola, A.; Strieder, F.; Aliotta, M.; Anders, M.; Bemmerer, D.; Broggini, C.; Corvisiero, P.; Elekes, Z.; Fulop, Zs.; Gervino, G.; Guglielmetti, G.; Gustavino, C.; Gyurky, Gy.; Imbriani, G.; José Pont, Jordi; Junker, M.; et al., .Procesos para una Astronomía que le aporte a Colombiahttp://biblioteca.universia.net/html_bura/ficha/params/title/procesos-astronomia-aporte-colombia/id/60164429.html
Duque Escobar, GonzaloHigh-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfshttp://biblioteca.universia.net/html_bura/ficha/params/title/high-resolution-smoothed-particle-hydrodynamics-simulations-of-the-merger-of/id/59950258.html
Context. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this
process has been proposed to explain several interesting astrophysical phenomena.
Aims. We present the results of a set of high-resolution simulations of the merging process of two white dwarfs.
Methods. We use an up-to-date Smoothed Particle Hydrodynamics code which incorporates very detailed input physics and an
improved treatment of the artificial viscosity. Ou...Lorén Aguilar, Pablo; Isern Vilaboy, Jordi; García-Berro Montilla, EnriqueSinergia y pertinencia en las ciencias básicashttp://biblioteca.universia.net/html_bura/ficha/params/title/sinergia-pertinencia-ciencias-basicas/id/59803518.html
Duque Escobar, GonzaloThe white dwarf population of tri-axial haloeshttp://biblioteca.universia.net/html_bura/ficha/params/title/the-white-dwarf-population-of-tri-axial-haloes/id/59687938.html
The nature of the several microlensing events observed by the MACHO team towards
the Large Magellanic Cloud (LMC) is still a controversial subject. Substellar objects and stars with
masses larger than ~ 1M¿ have been ruled out as major components of a Massive Astrophysical
Halo Object (MACHO) Galactic halo. Stars of near half-solar mass, in particular white dwarfs,
appear to be the best candidates to explain the observed microlensing events. On the other hand,
observational evidence based on ...Torres Gil, Santiago; Camacho Díaz, Judit; García-Berro Montilla, EnriqueMonte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: The effects...http://biblioteca.universia.net/html_bura/ficha/params/title/monte-carlo-simulations-of-post-common-envelope-white-dwarf-main/id/59594493.html
Context. Detached white dwarf + main sequence (WD+MS) post-common-envelope binaries (PCEBs) are perhaps the most suitable objects for testing predictions of close-compact binary-star evolution theories, in particular, common-envelope (CE) evolution. Consequently, the population of WD+MS PCEBs has been simulated by several authors in the past and the predictions have been compared with the observations. However, most of those theoretical predictions did not take into account the possible contr...Zorotovic, Monica; García-Berro Montilla, Enrique; Schreiber, Mathias R.; Camacho Díaz, Judit; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Gänsicke, Boris T.On the origin of high-field magnetic white dwarfshttp://biblioteca.universia.net/html_bura/ficha/params/title/on-the-origin-of-high-field-magnetic-white-dwarfs/id/59594492.html
Every two years, white dwarf researchers and enthusiasts meet to exchange their knowledge and discuss recent developments in white dwarf theory and observations. These proceedings are from the 18th European White Dwarf Workshop held at Pedagogical University of Cracow (Krakow, Poland) on 13th - 17th August, 2012.
The scientific topics discussed in this Workshop included: pulsating white dwarfs; luminosity function, mass distribution, and populations; white dwarf structure and evolution; wh...García-Berro Montilla, Enrique; Torres Gil, Santiago; Loren Aguilar, Pablo; Aznar Siguan, Gabriela; Camacho Díaz, Judit; Kulebi, Baybar; Isern Vilaboy, Jordi; Althaus, Leandro Gabriel; Corsico, Alejandro H.Double degenerate mergers as progenitors of high-field magnetic white dwarfshttp://biblioteca.universia.net/html_bura/ficha/params/title/double-degenerate-mergers-as-progenitors-of-high-field-magnetic-white/id/59594491.html
High-field magnetic white dwarfs have been long suspected to be the
result of stellar mergers.
However, the nature of the coalescing stars and the precise mech
anism that produces the magnetic
field are still unknown. Here we show that the hot, convective, diffe
rentially rotating corona present in
the outer layers of the remnant of the merger of two degenerate
cores is able to produce magnetic fields
of the required strength that do not decay for long timescales. We
also show, using an state...García-Berro Montilla, Enrique; Lorén Aguilar, Pablo; Aznar Siguan, Gabriela; Torres Gil, Santiago; Camacho Díaz, Judit; Althaus, Leandro Gabriel; Córsico, Alejando Hugo; Kulebi, Baybar; Isern Vilaboy, JordiMonte Carlo simulations of post-common-envelope white dwarf plus main sequence binaries: comparis...http://biblioteca.universia.net/html_bura/ficha/params/title/monte-carlo-simulations-of-post-common-envelope-white-dwarf-plus/id/59594490.html
Context. Detached white dwarf + main sequence (WD+MS) systems represent the simplest population of post-common envelope binaries (PCEBs). Since the ensemble properties of this population carries important information about the characteristics of the common-envelope (CE) phase, it deserves close scrutiny. However, most population synthesis studies do not fully consider the effects of the observational selection biases of the samples used to compare with the theoretical simulations.; Aims. Here...Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R.; Rebassa-Mansergas, Alberto; Nebot Gómez-Moran, Ada; Gänsicke, Boris T.White dwarfs with hydrogen-deficient atmospheres and the dark matter content of the Galaxyhttp://biblioteca.universia.net/html_bura/ficha/params/title/white-dwarfs-with-hydrogen-deficient-atmospheres-and-the-dark-matter/id/59522788.html
Peer ReviewedTorres Gil, Santiago; Camacho Díaz, Judit; Isern Vilaboy, Jordi; García-Berro Montilla, EnriqueObservational and Numerical Simulation Study of a Sequence of Eight Atmospheric Density Currents ...http://biblioteca.universia.net/html_bura/ficha/params/title/observational-and-numerical-simulation-study-of-sequence-of-eight-atmospheric/id/59483385.html
A sequence of eight atmospheric density current fronts occurred in consecutive days are identified and analyzed using micrometeorological time series and numerical simulations. Observations were collected in the context of the INTERCLE project, which took place from September 2002 to November 2003 at the CIBA (Research Centre for the Lower Atmosphere) site located over the northern Spanish plateau. Numerical simulations used the Weather Research and Forecast (WRF) model with fine horizontal r...Soler Duffour, Maria Rosa; Udina, Mireia; Ferreres Soler, EnriquetaObservational and Numerical Simulation Study of a Sequence of Eight Atmospheric Density Currents ...http://biblioteca.universia.net/html_bura/ficha/params/title/observational-and-numerical-simulation-study-of-sequence-of-eight-atmospheric/id/59483385.html
A sequence of eight atmospheric density current fronts occurred in consecutive days are identified and analyzed using micrometeorological time series and numerical simulations. Observations were collected in the context of the INTERCLE project, which took place from September 2002 to November 2003 at the CIBA (Research Centre for the Lower Atmosphere) site located over the northern Spanish plateau. Numerical simulations used the Weather Research and Forecast (WRF) model with fine horizontal r...Soler Duffour, Maria Rosa; Udina, Mireia; Ferreres Soler, EnriquetaCobalt-56 gamma-ray emission lines from the type Ia supernova 2014Jhttp://biblioteca.universia.net/html_bura/ficha/params/title/cobalt-56-gamma-ray-emission-lines-from-the-type-ia/id/59429947.html
A type Ia supernova is thought to be a thermonuclear explosion of either a single carbon–oxygen white dwarf or a pair of merging white dwarfs. The explosion fuses a large amount of radioactive 56Ni. After the explosion, the decay chain from 56Ni to 56Co to 56Fe generates gamma-ray photons, which are reprocessed in the expanding ejecta and give rise to powerful optical emission. Here we report the detection of 56Co lines at energies of 847 and 1,238 kiloelectronvolts and a gamma-ray continuum ...Churazov, Eugene; Sunyaev, Rashid; Isern Vilaboy, Jordi; Knodlseder, Jurgen; Jean, Pierre; Lebrun, François; Chugai, Nikolai; Grebenev, Sergei; Bravo Guil, Eduardo; Sazonov, Sergei; Renaud, MatthieuComparison of theoretical white dwarf cooling timescales (Research Note)http://biblioteca.universia.net/html_bura/ficha/params/title/comparison-of-theoretical-white-dwarf-cooling-timescales-research-note/id/59429928.html
Context. An accurate assessment of white dwarf cooling times is paramount so that white dwarf cosmochronology of Galactic populations can be put on more solid grounds. This issue is particularly relevant in view of the enhanced observational capabilities provided by the next generation of extremely large telescopes, that will offer more avenues to use white dwarfs as probes of Galactic evolution and test-beds of fundamental physics. Aims. We estimate for the first time the consistency of resu...Salaris, Maurizio; Althaus, Leandro Gabriel; García-Berro Montilla, EnriqueThe post-merger magnetized evolution of white dwarf binaries: The double-degenerate channel of su...http://biblioteca.universia.net/html_bura/ficha/params/title/the-post-merger-magnetized-evolution-of-white-dwarf-binaries-the/id/59424528.html
Type Ia supernovae (SNe Ia) play a crucial role as standardizable cosmological candles, though the nature of their progenitors is a subject of active investigation. Recent observational and theoretical work has pointed to merging white dwarf binaries, referred to as the double-degenerate channel, as the possible progenitor systems for some SNe Ia. Additionally, recent theoretical work suggests that mergers which fail to detonate may produce magnetized, rapidly rotating white dwarfs. In this p...Ji, Suoqing; Fisher, Robert T.; García-Berro Montilla, Enrique; Tzeferacos, Petros; Jordan, George C.; Lee, Dongwook; Loren Aguilar, Pablo; Cremer, Pascal; Behrends, JanModulación de fase para interferometría láser homodinahttp://biblioteca.universia.net/html_bura/ficha/params/title/modulacion-fase-interferometria-laser-homodina/id/59100907.html
[ANGLÈS] Gravitational waves were predicted by Albert Einstein as a direct implication of the theory of General Relativity (1915). Although there are compelling experimental evidences of its existence, its detection has not been possible to the date. LISA (Laser interferometer Space Antenna) mission and its precursor mission LISA Pathfinder were designed as a complementary to terrestrial detectors, like LIGO and VIRGO, in order to obtain direct detection of gravitational waves at the frequenc...Terán Miranda, MarceloThe effects of metallicity on the Galactic disk population of white dwarfshttp://biblioteca.universia.net/html_bura/ficha/params/title/the-effects-of-metallicity-on-the-galactic-disk-population-of/id/59100784.html
Context. It has been known for a long time that stellar metallicity plays a significant role in the determination of the ages of the different Galactic stellar populations, when main sequence evolutionary tracks are employed. Aims. Here, we analyze the role that metallicity plays on the white dwarf luminosity function of the Galactic disk, which is often used to determine its age. Methods. We employ a Monte Carlo population synthesis code that accounts for the properties of the population of ...Cojocaru, Elena Ruxandra; Torres Gil, Santiago; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique